Among the statements (a)-(d), the incorrect ones are:
(a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments
(b) When Δ₀

Question

Among the statements (a)-(d), the incorrect ones are:
(a) Octahedral Co(III) complexes with strong field ligands have very high magnetic moments
(b) When Δ₀ < P, the d-electron configuration of Co(III) in an octahedral complex is 
(c) Wavelength of light absorbed by  is lower than that of 
(d) If the Δ₀ for an octahedral complex of Co(III) is 18,000 cm⁻¹, the Δt for its tetrahedral complex with the same ligand will be 16,000 cm⁻¹

Canvas Classes · Accepted Answer

Strategy:
 Work through the four statements individually based on crystal field theory principles.

Step 1: Evaluate (a) and (b)
- (a): "Octahedral Co(III) complexes with strong field ligands have very high magnetic moments". False. Strong field ligands make Co(III) () low-spin (), yielding a magnetic moment of 0 BM.
- (b): "When , the config is ". True. This describes the high-spin state for a  ion correctly.

Step 2: Evaluate (c) and (d)
- (c): Wavelength of light absorbed by  is lower than .

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